Vitalii Diravka created SLF4J-443: ------------------------------------- Summary: Log4JLogger from commons-logging is absent in jcl-over-slf4j Key: SLF4J-443 URL: https://jira.qos.ch/browse/SLF4J-443 Project: SLF4J Issue Type: Improvement Components: jcl-over-slf4j Affects Versions: 1.8.0-beta2, 1.7.25 Environment: All Reporter: Vitalii Diravka Assignee: SLF4J developers list In the process of updating hadoop libraries in Apache Drill project I faced the following issue: java.lang.NoClassDefFoundError: org/apache/commons/logging/impl/Log4JLogger. hadoop-hdfs uses commons-logging library, but Drill uses jcl-over-slf4j and bans commons-logging. https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/... Looks like the presence of Log4JLogger class in org.apache.commons.logging.impl of jcl-over-slf4j could resolve the issue. https://github.com/qos-ch/slf4j/tree/master/jcl-over-slf4j/src/main/java/org... -- This message was sent by Atlassian JIRA (v7.3.1#73012)